Github user srowen commented on the issue: https://github.com/apache/spark/pull/14054 Interesting, well maybe `READ_UNCOMMITTED` is still a pretty good setting, because the transaction here doesn't even read anything and doesn't care about what it might read, but sounds like it could be promoted anyway. Yes, how about using the specified isolation level if available, and falling back to just leaving the default if not available, but transactions are supported in general. I like that as it is more robust.
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